2.3.12
Please include reasons for each step.
From The Real Numbers and Real Analysis
https://muhammadalfaridzi.files.wordpress.com/2014/05/the_real_numbers_and_real_analysis.pdf
Extracted text: 2.3.12 Prove Lemma 2.3.10 (2). Only need to prove #2 Of Lemma 2.3.10. Lemma 2.3.10. Let a E R. 1. a s0 if and only if a < ɛ="" for="" all="" ɛ="">0 2. a 2 0 if and only if a > -e for all ɛ > 0 3. a = 0 if and only if lal < ɛ="" for="" all="" ɛ=""> 0.
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